Mold part

A modular concrete block mold comprising

• a lower mold part, which comprises a frame comprising a plurality of frame parts detachably connected to one another without welding,
• an insert comprising a plurality of insert parts detachably connected to one another or to the frame without welding, and a plurality of mold cavities adapted to be filled by a concrete mixture,
• an upper mold part comprising a stamping unit for compacting the concrete mixture in the plurality of mold cavities, the stamping unit comprising a plurality of pressure plates detachably and indirectly connected to one another without welding and designed to engage in the plurality of mold cavities,
• wherein the lower mold part or the upper mold part has an additively manufactured region or is an entirely additively manufactured mold part, and
• wherein the additively manufactured region or the entirely additively manufactured mold part has a layered structure or is protruding embossing without milling radii or has an undercut or has a cavity, and
• wherein the additively manufactured region is a 3D metal printing region or the entirely additively manufactured mold part is additively manufactured by 3D metal printing.